The nap timer that actually answers the question every other app skips: how long should you sleep, and when? Tell Naplane your energy, your goal, and your chronotype — it picks the right length, counts you down with a calm brown-noise sound bath, and wakes you with a melodic chime designed to minimize grogginess.
Tell Naplane your chronotype — Morning Lark, Flexible, or Night Owl. The recommendation engine shifts its hour-of-day scoring to match your personal circadian rhythm so nap suggestions improve automatically. Your ideal nap window is displayed on the Plan tab at a glance.
Every nap in your history now shows a 0–100 quality score. It weighs four factors: how you felt on waking (40 pts), whether you ran the full planned duration (25 pts), how well your start time aligned with your chronotype's ideal window (25 pts), and whether the length matched your goal (10 pts). The 30-day summary shows your monthly average.
The wake alarm is now a synthesized rising A–C–E arpeggio with a 600 ms fade-in, generated entirely on-device — no audio file bundled. Research shows melodic alarm tones measurably reduce sleep inertia vs. harsh beeps. Toggle back to the system sound in Settings if you prefer.
Set the energy slider (1 = Exhausted, 5 = Wired), pick a goal — Recharge, Memory, Creativity, or Coffee Nap — and tap Plan My Nap. An on-device formula weighs the time of day (adjusted for your chronotype), your energy level, your goal, and your recent nap history to recommend one of five research-backed lengths: 10, 20, 30, 60, or 90 minutes. All five alternatives are shown and tappable so you can override transparently.
Morning Larks hit their circadian alertness peak early and dip around noon–2 pm. Flexible nappers follow the textbook 2–3 pm dip. Night Owls peak later and dip around 3–4 pm. Setting your chronotype shifts the recommender's hour-of-day scoring by one hour in each direction and displays your ideal window on the Plan screen. Source: Roenneberg et al. (2004) J Biol Rhythms 19:432–441.
A full-screen countdown ring shows elapsed time and the exact wake time. A synthesized brown-noise sound bath fades in gently and out at the end — generated in real time on the audio thread, no audio file bundled, so the app is tiny. Toggle it off any time. The screen stays awake while the ring runs (optional).
When the nap ends, Naplane plays a synthesized rising A–C–E major arpeggio (440→528→659 Hz) with a gradual 600 ms fade-in. Research in PLoS ONE (McFarlane et al. 2020) found melodic alarm tones reduce sleep inertia compared to harsh, abrupt beeps. The chime is generated on the audio thread — no bundled audio file. The classic system sound is available as an alternative in Settings.
Every nap in your history gets a 0–100 composite quality score shown right in the log. The score weighs felt rating (40 pts), completion (25 pts), timing alignment with your chronotype's ideal window (25 pts), and goal–length match (10 pts). A perfect nap — Amazing rating, fully completed, ideal timing, goal-matched length — scores 100. The 30-day summary card shows your average quality score across recent sessions.
After the timer finishes, Naplane shows three options: Groggy, Refreshed, or Amazing. Tap one and it logs the outcome. The recommender reads your recent felt ratings and adjusts its scores — if the 60-minute nap always leaves you groggy, it quietly surfaces shorter options next time, without requiring any setup.
The History tab shows a bar chart of your daily nap totals for the last seven or thirty days, a last-24-hour summary, an average felt score, a nap streak counter, and a full chronological log of every session with its goal, duration, quality score, and outcome. Long-press any entry to delete it individually. A menu in the top-right exports a CSV or clears all records.
The Guide tab is a browsable offline reference covering five categories: Nap Lengths (what each duration actually does to your brain), Best Time to Nap (circadian dip science, chronotype shifts), Sleep Inertia (what it is, why it happens, how to avoid it), Coffee Nap (the full protocol), and Technique (temperature, light, noise masking, position). Filter by category; tap any entry to expand the full explanation and citation.
Most people need 10–20 minutes to actually fall asleep. With a buffer set (e.g., 15 minutes), the countdown screen shows a calm wind-down period first — a progress bar tracks it without pressure. Once the buffer ends, the nap clock starts automatically. You can skip the buffer at any time by tapping the Skip button. The buffer time is configurable in Settings and is separate from the nap length shown to the user.
After logging enough rated naps, the History tab surfaces up to three personal insights drawn from your own data: the time-of-day window where your Amazing naps cluster, the goal and length combination with your highest average rating, and whether you tend to nap better when rested or exhausted. More rated naps produce more reliable insights.
Naplane is a calming guide, not a medical device. If you feel persistent fatigue, talk to your doctor. Nap-length recommendations are grounded in published sleep science but are not clinical advice.